1、100x63mm square ruler, the surface is finely processed, the error is small, and the measurement is more accurate. 2、The ruler body is thickened to increase the contact area with the measuring workpiece, and the measurement is more stable. 3、There is milled groove in the inner corner, which can quickly remove burrs and debris and make the working surface more tidy. 4、Made of high‑quality stainless steel, it is rust‑proof and not easy to break, and has a long service life. 5、The knife‑edge square is suitable for detecting angles and marking parts, and is a useful measuring tool for engineering construction. Item Type: Knife Edge Ruler Material: Stainless steel Product Size (L x W): Approx. 100 x 63mm / 3.9 x 2.5in Thickness: Approx. 5mm / 0.2in Purpose: Suitable for detecting angles and marking on parts 1 x Knife Edge Ruler